Servo valve friction force detection device

Abstract

The utility model discloses a servo valve friction force detection device, and relates to the servo valve technology field, the servo valve friction force detection device comprises a linear driving assembly, a fixing assembly and a rotation driving assembly which are arranged in sequence, the fixing assembly comprises a first fixing device and a second fixing device, the first fixing device is arranged at one end close to the linear driving assembly, the second fixing device is arranged at one end close to the rotary driving assembly, the linear driving assembly drives the first fixing device to do linear reciprocating motion, and the rotary driving assembly drives the second fixing device to do coaxial rotary motion; the servo valve friction force detection device further comprises a supporting piece which is arranged on the outer surface of the fixing assembly in a sleeving mode. The linear driving assembly and the rotary driving assembly are combined, measurement is more comprehensive, quantification of friction force along with angle change forms a rule, and matching precision and working reliability are ensured; the supporting piece overcomes the gravity borne by the fixing assembly, the valve element and the valve sleeve, and the coaxiality and the measurement accuracy in the working process are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of servo valve technology, and in particular to a servo valve friction force detection device. Background Technology

[0002] Servo valves, as high-precision hydraulic control components, are widely used in aerospace, machine tool control, automation equipment, and hydraulic servo systems. Their performance directly determines the system's control accuracy and response speed. During the manufacturing process of servo valves, the fit accuracy between the valve core and valve sleeve is extremely critical, typically requiring a micron-level clearance to ensure accurate flow control and stable dynamic response. Traditional valve core and valve sleeve fit testing mainly relies on machining accuracy control and manual grinding processes, using a single-set grinding method to ensure matching.

[0003] However, in actual production, even with careful grinding, poor fit between the valve core and valve sleeve may still occur, leading to uneven friction distribution and affecting the sensitivity and lifespan of the servo valve. Therefore, there is an urgent need for a detection device capable of measuring the friction between the valve core and valve sleeve at different angles in a servo valve. This device would quantify the variation of friction with angle, ensuring fitting accuracy and operational reliability, and improving the overall performance stability of the servo valve. Summary of the Invention

[0004] The main purpose of this invention is to propose a servo valve friction force detection device, which aims to improve the detection accuracy of friction force in servo valves.

[0005] To achieve the above objectives, the present invention proposes a servo valve friction force detection device, which includes a linear drive assembly, a fixed assembly, and a rotary drive assembly arranged sequentially. The fixed assembly includes a first fixed device and a second fixed device. The first fixed device is located at one end near the linear drive assembly, and the second fixed device is located at one end near the rotary drive assembly. The linear drive assembly drives the first fixed device to perform linear reciprocating motion, and the rotary drive assembly drives the second fixed device to perform coaxial rotational motion.

[0006] The servo valve friction detection device also includes a support member, which is sleeved on the outer surface of the fixed component.

[0007] In one embodiment, the working position of the first fixing device and the working position of the second fixing device are coaxially arranged.

[0008] In one embodiment, the first fixing device and the second fixing device are provided with an air-floating alignment device for automatically adjusting the coaxiality of the first fixing device and the second fixing device.

[0009] In one embodiment, the servo valve friction force detection device further includes a base and a sliding component disposed on the base and near one end of the linear drive component, the linear drive component being disposed on the sliding component;

[0010] The support member includes a first support structure fixed to the outer surface of the first fixing device. The first support structure is disposed on the sliding assembly and drives the first fixing device to move closer to or away from the second fixing device by sliding. The support member also includes a second support structure slidably sleeved on the outer surface of the second fixing device. The second support structure is disposed on the base.

[0011] In one embodiment, the linear drive assembly includes a driven structure that passes axially through the first fixing device, the driven structure driving the first fixing device and the first support structure to reciprocate on the sliding assembly, and the driven structure is provided with a force sensor for detecting the friction force value.

[0012] In one embodiment, the rotary drive assembly includes a coupling that drives the second fixed device to rotate coaxially, and the coupling is provided with an angle sensor for detecting the rotation angle.

[0013] In one embodiment, the number of the first support structure is at least one, the number of the second support structure is at least two, and they are evenly arranged on the same clamping device.

[0014] In one embodiment, both the first fixing device and the second fixing device clamp the outside of the structure to be tested, and the clamping force can be adjusted.

[0015] In one embodiment, the first fixing device holds the interior of the structure to be tested against it, and the holding force is adjustable.

[0016] In one embodiment, the rotation angle range of the rotary drive assembly is 0-360°, and the rotation speed is 0.1 RPM-100 RPM.

[0017] The technical solution of this utility model combines a linear drive component with a rotary drive component. First, it can measure the frictional force of the axial movement and circumferential rotation of the valve core and valve sleeve, making the measurement more comprehensive and realizing the quantitative formation law of frictional force changing with angle, ensuring the fitting accuracy and working reliability, and improving the overall performance stability of the servo valve. Second, by setting up support components to overcome the gravity of the fixed components and valve body and valve sleeve, it ensures the coaxiality during operation, thereby eliminating the influence of external factors on the measurement results and further improving the fitting accuracy and the reliability of the measurement results. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an embodiment of the servo valve friction force detection device provided by this utility model;

[0020] Figure 2 Exploded view of a partial structure of another embodiment of the servo valve friction force detection device provided by this utility model;

[0021] Figure 3 A partial cross-sectional view of another embodiment of the servo valve friction force detection device provided by this utility model;

[0022] Figure 4 This is a partial structural cross-sectional view of another embodiment of the servo valve friction force detection device provided by this utility model.

[0023] Explanation of icon numbers:

[0024] 1. Servo valve friction force detection device;

[0025] 11. Linear drive assembly; 12. Driven structure; 13. Fixed assembly; 14. Coupling; 15. Rotary drive assembly; 16. Support; 17. Base; 18. Sliding assembly;

[0026] 121. Force sensor; 131. First fixing device; 132. Second fixing device; 141. Angle sensor; 161. First support structure; 162. Second support structure.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of this utility model, such directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the use of "and / or" or "and / or" throughout the text includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] Servo valves, as high-precision hydraulic control components, are widely used in aerospace, machine tool control, automation equipment, and hydraulic servo systems. Their performance directly determines the system's control accuracy and response speed. During the manufacturing process of servo valves, the fit accuracy between the valve core and valve sleeve is extremely critical, typically requiring a micron-level clearance to ensure accurate flow control and stable dynamic response. Traditional valve core and valve sleeve fit testing mainly relies on machining accuracy control and manual grinding processes, using a single-set grinding method to ensure matching.

[0032] However, in actual production, even with careful grinding, poor fit between the valve core and valve sleeve may still occur, leading to uneven friction distribution and affecting the sensitivity and lifespan of the servo valve. Therefore, there is an urgent need for a detection device capable of measuring the friction between the valve core and valve sleeve at different angles in a servo valve. This device would quantify the variation of friction with angle, ensuring fitting accuracy and operational reliability, and improving the overall performance stability of the servo valve.

[0033] This utility model proposes a servo valve friction force detection device 1.

[0034] Please combine Figures 1-4 In one embodiment of the present invention, the servo valve friction force detection device 1 includes a linear drive assembly 11, a fixing assembly 13, and a rotary drive assembly 15 arranged sequentially. The fixing assembly 13 includes a first fixing device 131 and a second fixing device 132. The first fixing device 131 is disposed at one end near the linear drive assembly 11, and the second fixing device 132 is disposed at one end near the rotary drive assembly 15. The linear drive assembly 11 drives the first fixing device 131 to perform linear reciprocating motion, and the rotary drive assembly 15 drives the second fixing device 132 to perform coaxial rotational motion. The servo valve friction force detection device 1 also includes a support member 16, which is sleeved on the outer surface of the fixing assembly 13.

[0035] Specifically, a driven structure 12 is provided between the linear drive assembly 11 and the first fixing device 131. One end of the driven structure 12 is fixed to the linear drive assembly 11, and the other end passes through the side wall of the first fixing device 131 and extends into the clamping space of the first fixing device 131. The driven structure 12 is driven by the linear drive assembly 11 to drive the first fixing device 131 to perform axial reciprocating motion.

[0036] Optionally, one end of the driven structure 12 is integrally connected to the linear drive assembly 11, either by thread or by snap-fit.

[0037] It should be noted that the driven structure 12 may be affected by stress during reciprocating operation, which may lead to work fatigue. If the structural performance is not strong enough, it will affect the service life. Therefore, a detachable connection is used to facilitate the replacement of the driven structure 12, while an integrated connection will reduce the installation process and improve the installation efficiency. It can be seen that the connection method between the driven structure 12 and the linear drive component 11 can change the complexity of the overall structure and affect the precision of the operation of the first fixed device 131. Therefore, the specific connection method is not limited here and is subject to actual needs.

[0038] Furthermore, a coupling 14 is provided between the rotary drive assembly 15 and the second fixing device 132. When the rotary drive assembly 15 is working, it rotates, and the coupling 14 rotates accordingly, driving the second fixing device 132 to rotate coaxially together.

[0039] It should be noted that the coupling 14 is driven to move the second fixing device 132, therefore, the relative position of the coupling 14 and the second fixing device 132 will not change.

[0040] Optionally, the coupling 14 is integrally connected to the second fixing device 132 by means of a threaded connection or a snap-fit ​​connection.

[0041] Specifically, the connection method between the coupling 14 and the second fixing device 132 is not limited and shall be determined according to actual needs.

[0042] In one embodiment, the working position of the fixing component 13 is coaxially arranged with the working position of the second fixing device 132.

[0043] It should be noted that the structure to be tested held by the fixing component 13 is usually the valve core and valve sleeve of the servo valve. When measuring the friction between the two, the valve core needs to be inserted into the valve sleeve and move relative to it to generate friction, and the value of the friction is then measured.

[0044] Understandably, the structure clamped and detected by the fixing component 13 usually has a certain length. If the clamping part is too short, the center of gravity of the structure to be detected will be outside the fixing component 13, which will cause the axis orientation of the device to be detected to change due to gravity. Therefore, the fixing component 13 needs to clamp half of the structure to be detected in order to effectively support the structure to be detected and thus improve the precision of the work.

[0045] Furthermore, when the valve core and valve sleeve are engaged, the higher the coaxiality, the more accurate the measured friction force. Therefore, after overcoming the influence of gravity on the structure to be tested, the working positions of the first fixing device 131 and the second fixing device 132 are made coaxial, which means that the structure to be tested is coaxial, which can further improve the precision of the test.

[0046] In one embodiment, an air-floating alignment device is provided in the first fixing device 131 and the second fixing device 132 for automatically adjusting the coaxiality of the first fixing device 131 and the second fixing device 132.

[0047] It should be noted that the air flotation centering device is mainly used to zero the working positions of the first fixed device 131 and the second fixed device 132, so that the two working positions are coaxial, that is, centered. Using this device to zero and center is more precise than manual zeroing and axis alignment, and is also more convenient to use.

[0048] In one embodiment, the servo valve friction force detection device 1 further includes a base 17 and a sliding component 18 disposed on the base 17 and close to one end of the linear drive component 11, wherein the linear drive component 11 is disposed on the sliding component 18.

[0049] The support member 16 includes a first support structure 161 fixed to the outer surface of the first fixing device 131. The first support structure 161 is disposed on the sliding assembly 18. The first fixing device 131 is moved closer to or away from the second fixing device 132 by sliding. The support member 16 also includes a second support structure 162 slidably sleeved on the outer surface of the second fixing device 132. The second support structure 162 is disposed on the base 17.

[0050] Specifically, in a specific embodiment of this utility model, the sliding component 18 includes a slide rail fixed on the base 17 and a sliding platform slidably disposed on the slide rail. The linear drive component 11 is disposed on the sliding platform and can reciprocate through the slide rail. The first support structure 161 is also disposed on the slide rail platform and moves together with the linear drive component 11, thereby realizing the reciprocating motion of the first fixing device 131.

[0051] Specifically, the second fixed device 132 supported by the second support structure 162 will rotate with the rotation drive device, so the second support structure 162 and the second fixed device 132 are slidably connected, and the second support structure 162 is fixedly connected to the base 17.

[0052] In one embodiment, there are two of each of the first support structure 161 and the second support structure 162, which are respectively disposed at both ends of the first fixing device 131 and the second fixing device 132.

[0053] It should be noted that, in order to overcome the gravitational influence of the first support structure 161, the second support structure 162, and the clamped structure to be tested, the first support structure 161 needs to support the first fixing device 131, and the second support structure 162 needs to support the second fixing device 132, thereby ensuring the coaxiality of the structure to be tested and reducing the influence of external factors on the test data.

[0054] In one embodiment, a force sensor 121 for detecting the value of frictional force is provided on the driven structure 12.

[0055] In one embodiment, the coupling 14 is provided with an angle sensor 141 for detecting the rotation angle.

[0056] Understandably, the force sensor 121 is used to detect the value of the sliding friction force generated when the valve core and valve sleeve move relative to each other, and the angle sensor 141 is used to detect the angle of relative rotation between the two. This makes it easier for users to quantify the law of friction force changing with angle, ensure matching accuracy and working reliability, and improve the overall performance stability of the servo valve.

[0057] In one embodiment, both the first fixing device 131 and the second fixing device 132 clamp the outside of the structure to be tested, and the clamping force can be adjusted.

[0058] Specifically, in the specific embodiments of this utility model, both the first fixing device 131 and the second fixing device 132 are pneumatic grippers.

[0059] More specifically, the clamping force of the pneumatic gripper is 20 N-70 N.

[0060] In this embodiment, there are at least two first support structures 161, which are evenly arranged around the outer periphery of the first fixing device 131, and at least two second support structures 162, which are evenly arranged around the outer periphery of the second fixing device 132.

[0061] It should be noted that if the pneumatic gripper has too little clamping force, it will be unable to stably clamp the structure to be tested, thus affecting the precision of the structure to be tested. If the clamping force is too large, it may damage the surface of the structure to be tested.

[0062] In one embodiment, the first fixing device 131 holds the interior of the structure to be tested against it, and the holding force is adjustable.

[0063] Specifically, in a specific embodiment of this utility model, one end of the first fixing device 131 extends into the interior of the structure to be tested, and the interior of the extended end of the first fixing device 131 is hollow. By inserting a matching insert, the extended end expands and abuts against the inner wall of the structure to be tested. The diameter of one end of the insert gradually decreases from the middle to the far end, and the hollow interior is set in accordance with its structure. Therefore, by adjusting the extension length of the insert, the degree of expansion of the extended end of the first fixing device 131 can be adjusted, thereby adjusting the abutting force.

[0064] In addition, the hollow opening inside the first fixing device 131 faces the side of the second fixing device 132, which allows the user to quickly adjust the insert and thus adjust and control the resistance force of the first fixing device 131 against the structure to be tested.

[0065] Optionally, the insert can make smooth contact with the first fixing device 131, or be screwed in or out by threads. This is not limited and depends on the actual production structure.

[0066] In this embodiment, the number of first support structures 161 is at least one.

[0067] It should be noted that the first fixing device 131 and the driven structure 12 are connected by a snap-fit. One end of the driven structure 12 extends into the first fixing device 131 and abuts or engages with part of the inner wall of the first fixing device 131 to form a fixed connection, thereby avoiding the influence of its own friction on the detection data during operation.

[0068] In one embodiment, the rotation angle range of the rotary drive assembly 15 is 0-360°, and the rotation speed is 0.1 RPM-100 RPM.

[0069] The technical solution of this utility model combines the linear drive component 11 with the rotary drive component 15. First, it can measure the frictional force of the axial movement and the circumferential rotation of the valve core and valve sleeve, making the measurement more comprehensive and realizing the quantitative formation law of frictional force changing with angle, ensuring the fitting accuracy and working reliability, and improving the overall performance stability of the servo valve. Second, by setting the support component 16, it overcomes the gravity of the fixed component 13 and the valve body and valve sleeve, ensuring the coaxiality and measurement accuracy during the working process, thereby eliminating the influence of external factors on the measurement results, and further improving the fitting accuracy and the reliability of the measurement results.

[0070] It should be understood that the terms "one embodiment" or "one example" throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in one example" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0071] In various embodiments of this utility model, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this utility model embodiment.

[0072] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It is particularly important to note that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0073] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A servo valve friction force detection device, characterized in that: The servo valve friction detection device comprises a linear driving assembly, a fixing assembly and a rotary driving assembly arranged in sequence, the fixing assembly comprises a first fixing device and a second fixing device, the first fixing device is arranged at one end close to the linear driving assembly, the second fixing device is arranged at one end close to the rotary driving assembly, the linear driving assembly drives the first fixing device to make linear reciprocating motion, and the rotary driving assembly drives the second fixing device to make coaxial rotary motion. The servo valve friction detection device further comprises a support, and the support is sleeved on the outer surface of the fixing assembly.

2. The servo valve friction detection apparatus of claim 1, wherein: The working position of the first fixing device is coaxially arranged with the working position of the second fixing device.

3. The servo valve friction detection apparatus of claim 2, wherein: Air floating centering devices are arranged in the first fixing device and the second fixing device, and are used for automatically adjusting the coaxiality of the first fixing device and the second fixing device.

4. The servo valve friction detection apparatus of claim 1, wherein: The servo valve friction detection device further comprises a base, a sliding assembly arranged on the base and close to one end of the linear driving assembly, and the linear driving assembly is arranged on the sliding assembly. The support comprises a first support structure fixed on the outer surface of the first fixing device, the first support structure is arranged on the sliding assembly, and the first fixing device is driven to move close to or away from the second fixing device through sliding, and the support further comprises a second support structure sleeved on the outer surface of the second fixing device, and the second support structure is arranged on the base.

5. The servo valve friction force detection apparatus as recited in claim 4, wherein: The linear driving assembly comprises a driven structure axially penetrating through the first fixing device, the driven structure drives the first fixing device and the first support structure to reciprocate on the sliding assembly, and a force sensor for detecting the friction value is arranged on the driven structure.

6. The servo valve friction force detection apparatus as recited in claim 4, wherein: The rotary driving assembly comprises a shaft coupling for driving the second fixing device to rotate coaxially, and an angle sensor for detecting the rotation angle is arranged on the shaft coupling.

7. The servo valve friction force detection apparatus as recited in claim 4, wherein: The number of the first support structure is at least one, the number of the second support structure is at least two, and the first support structure and the second support structure are evenly arranged on the same clamping device.

8. The servo valve friction detection apparatus of claim 1, wherein: The first fixing device and the second fixing device clamp the outside of the structure to be detected, and the clamping force can be adjusted.

9. The servo valve friction detection apparatus of claim 1, wherein: The first fixing device abuts against the inside of the structure to be detected, and the abutting force can be adjusted.

10. The servo valve friction detection apparatus of claim 1, wherein: The rotation angle range of the rotary driving assembly is 0-360°, and the rotation speed is 0.1 RPM-100 RPM.

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